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Title: Rotation commensurate echo of asymmetric molecules—Molecular fingerprints in the time domain

Using the pulses of terahertz free electron laser and ultra-fast Schottky diode detectors, we observed the coherent transients within a free induction decay of gaseous nitrogen dioxide NO{sub 2}. The laser excited different sub-bands of rotation spectra of NO{sub 2} containing about 50–70 lines. The free induction signal continued more than 30 ns and consisted of many echo-like bursts duration about 0.2 ns. Unlike the similar effect observed previously for linear and symmetric top molecules, the sequence of echo bursts is not periodic. The values for delay of individual echo are stable, and the set of these delays can be considered as a “molecular fingerprint” in the time domain.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1]
  1. Institute of Chemical Kinetics and Combustion, Novosibirsk 630090 (Russian Federation)
  2. (Russian Federation)
  3. Budker Institute of Nuclear Physics, Novosibirsk 630090 (Russian Federation)
Publication Date:
OSTI Identifier:
22395602
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 26; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ASYMMETRY; ELECTROMAGNETIC PULSES; FREE ELECTRON LASERS; LASER RADIATION; MOLECULES; NITROGEN DIOXIDE; PERIODICITY; PHOTON-MOLECULE COLLISIONS; ROTATION; ROTATIONAL STATES; SCHOTTKY BARRIER DIODES; SYMMETRY; TRANSIENTS